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c906108c SS |
1 | /* Native support for Sun 386i's for GDB, the GNU debugger. |
2 | Copyright (C) 1986, 1987, 1989, 1991, 1992 Free Software Foundation, Inc. | |
3 | Changes for sun386i by Jean Daniel Fekete (jdf@litp.univ-p6-7.fr), | |
4 | C2V Paris, April 89. | |
5 | ||
c5aa993b | 6 | This file is part of GDB. |
c906108c | 7 | |
c5aa993b JM |
8 | This program is free software; you can redistribute it and/or modify |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
c906108c | 12 | |
c5aa993b JM |
13 | This program is distributed in the hope that it will be useful, |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
c906108c | 17 | |
c5aa993b JM |
18 | You should have received a copy of the GNU General Public License |
19 | along with this program; if not, write to the Free Software | |
20 | Foundation, Inc., 59 Temple Place - Suite 330, | |
21 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
22 | |
23 | #include "defs.h" | |
24 | #include "frame.h" | |
25 | #include "inferior.h" | |
26 | #include "gdbcore.h" | |
27 | ||
28 | #include <sys/param.h> | |
29 | #include <sys/dir.h> | |
30 | #include <sys/user.h> | |
31 | #include <signal.h> | |
32 | #include <sys/ioctl.h> | |
33 | #include <fcntl.h> | |
34 | ||
35 | #include <sys/ptrace.h> | |
36 | #include <machine/reg.h> | |
37 | ||
38 | #include <sys/file.h> | |
39 | #include "gdb_stat.h" | |
40 | #include <sys/core.h> | |
c906108c | 41 | \f |
c5aa993b | 42 | |
c906108c SS |
43 | /* Machine-dependent code which would otherwise be in corefile.c */ |
44 | /* Work with core files, for GDB. */ | |
c906108c | 45 | \f |
c5aa993b | 46 | |
c906108c | 47 | void |
fba45db2 | 48 | core_file_command (char *filename, int from_tty) |
c906108c SS |
49 | { |
50 | int val; | |
c906108c SS |
51 | |
52 | /* Discard all vestiges of any previous core file | |
53 | and mark data and stack spaces as empty. */ | |
54 | ||
55 | if (corefile) | |
56 | free (corefile); | |
57 | corefile = 0; | |
58 | ||
59 | if (corechan >= 0) | |
60 | close (corechan); | |
61 | corechan = -1; | |
62 | ||
63 | data_start = 0; | |
64 | data_end = 0; | |
65 | stack_start = STACK_END_ADDR; | |
66 | stack_end = STACK_END_ADDR; | |
67 | ||
68 | /* Now, if a new core file was specified, open it and digest it. */ | |
69 | ||
70 | if (filename) | |
71 | { | |
72 | filename = tilde_expand (filename); | |
73 | make_cleanup (free, filename); | |
c5aa993b | 74 | |
c906108c SS |
75 | if (have_inferior_p ()) |
76 | error ("To look at a core file, you must kill the program with \"kill\"."); | |
77 | corechan = open (filename, O_RDONLY, 0); | |
78 | if (corechan < 0) | |
79 | perror_with_name (filename); | |
80 | ||
81 | { | |
82 | struct core corestr; | |
83 | ||
84 | val = myread (corechan, &corestr, sizeof corestr); | |
85 | if (val < 0) | |
86 | perror_with_name (filename); | |
87 | if (corestr.c_magic != CORE_MAGIC) | |
88 | error ("\"%s\" does not appear to be a core dump file (magic 0x%x, expected 0x%x)", | |
89 | filename, corestr.c_magic, (int) CORE_MAGIC); | |
90 | else if (sizeof (struct core) != corestr.c_len) | |
c5aa993b JM |
91 | error ("\"%s\" has an invalid struct core length (%d, expected %d)", |
92 | filename, corestr.c_len, (int) sizeof (struct core)); | |
c906108c SS |
93 | |
94 | data_start = exec_data_start; | |
95 | data_end = data_start + corestr.c_dsize; | |
96 | stack_start = stack_end - corestr.c_ssize; | |
97 | data_offset = sizeof corestr; | |
98 | stack_offset = sizeof corestr + corestr.c_dsize; | |
99 | ||
100 | memcpy (registers, &corestr.c_regs, sizeof corestr.c_regs); | |
101 | ||
102 | memcpy (®isters[REGISTER_BYTE (FP0_REGNUM)], | |
c5aa993b JM |
103 | corestr.c_fpu.f_fpstatus.f_st, |
104 | sizeof corestr.c_fpu.f_fpstatus.f_st); | |
c906108c | 105 | memcpy (®isters[REGISTER_BYTE (FPC_REGNUM)], |
c5aa993b JM |
106 | &corestr.c_fpu.f_fpstatus.f_ctrl, |
107 | sizeof corestr.c_fpu.f_fpstatus - | |
108 | sizeof corestr.c_fpu.f_fpstatus.f_st); | |
c906108c SS |
109 | |
110 | /* the struct aouthdr of sun coff is not the struct exec stored | |
111 | in the core file. */ | |
112 | memcpy (&core_aouthdr, &corestr.c_aouthdr, sizeof (struct exec)); | |
113 | #ifndef COFF_ENCAPSULATE | |
114 | core_aouthdr.magic = corestr.c_aouthdr.a_info; | |
c5aa993b | 115 | core_aouthdr.vstamp = /*SUNVERSION */ 31252; |
c906108c SS |
116 | #endif |
117 | printf_unfiltered ("Core file is from \"%s\".\n", corestr.c_cmdname); | |
118 | if (corestr.c_signo > 0) | |
119 | printf_unfiltered ("Program terminated with signal %d, %s.\n", | |
c5aa993b | 120 | corestr.c_signo, safe_strsignal (corestr.c_signo)); |
c906108c SS |
121 | } |
122 | if (filename[0] == '/') | |
123 | corefile = savestring (filename, strlen (filename)); | |
124 | else | |
125 | { | |
126 | corefile = concat (current_directory, "/", filename, NULL); | |
127 | } | |
128 | ||
129 | flush_cached_frames (); | |
130 | select_frame (get_current_frame (), 0); | |
131 | ||
132 | validate_files (); | |
133 | } | |
134 | else if (from_tty) | |
135 | printf_unfiltered ("No core file now.\n"); | |
136 | } | |
137 | ||
fba45db2 | 138 | i387_to_double (char *from, char *to) |
c906108c SS |
139 | { |
140 | long *lp; | |
141 | /* push extended mode on 387 stack, then pop in double mode | |
c5aa993b | 142 | |
c906108c SS |
143 | * first, set exception masks so no error is generated - |
144 | * number will be rounded to inf or 0, if necessary | |
145 | */ | |
c5aa993b | 146 | asm ("pushl %eax"); /* grab a stack slot */ |
c906108c SS |
147 | asm ("fstcw (%esp)"); /* get 387 control word */ |
148 | asm ("movl (%esp),%eax"); /* save old value */ | |
c5aa993b | 149 | asm ("orl $0x3f,%eax"); /* mask all exceptions */ |
c906108c SS |
150 | asm ("pushl %eax"); |
151 | asm ("fldcw (%esp)"); /* load new value into 387 */ | |
c5aa993b | 152 | |
c906108c SS |
153 | asm ("movl 8(%ebp),%eax"); |
154 | asm ("fldt (%eax)"); /* push extended number on 387 stack */ | |
155 | asm ("fwait"); | |
156 | asm ("movl 12(%ebp),%eax"); | |
157 | asm ("fstpl (%eax)"); /* pop double */ | |
158 | asm ("fwait"); | |
c5aa993b | 159 | |
c906108c | 160 | asm ("popl %eax"); /* flush modified control word */ |
c5aa993b | 161 | asm ("fnclex"); /* clear exceptions */ |
c906108c SS |
162 | asm ("fldcw (%esp)"); /* restore original control word */ |
163 | asm ("popl %eax"); /* flush saved copy */ | |
164 | } | |
165 | ||
fba45db2 | 166 | double_to_i387 (char *from, char *to) |
c906108c SS |
167 | { |
168 | /* push double mode on 387 stack, then pop in extended mode | |
169 | * no errors are possible because every 64-bit pattern | |
170 | * can be converted to an extended | |
171 | */ | |
172 | asm ("movl 8(%ebp),%eax"); | |
173 | asm ("fldl (%eax)"); | |
174 | asm ("fwait"); | |
175 | asm ("movl 12(%ebp),%eax"); | |
176 | asm ("fstpt (%eax)"); | |
177 | asm ("fwait"); | |
178 | } | |
179 | ||
180 | void | |
fba45db2 | 181 | fetch_inferior_registers (int regno) |
c906108c SS |
182 | { |
183 | struct regs inferior_registers; | |
184 | struct fp_state inferior_fp_registers; | |
c906108c SS |
185 | |
186 | registers_fetched (); | |
187 | ||
188 | ptrace (PTRACE_GETREGS, inferior_pid, | |
c5aa993b | 189 | (PTRACE_ARG3_TYPE) & inferior_registers); |
c906108c | 190 | ptrace (PTRACE_GETFPREGS, inferior_pid, |
c5aa993b | 191 | (PTRACE_ARG3_TYPE) & inferior_fp_registers); |
c906108c SS |
192 | |
193 | memcpy (registers, &inferior_registers, sizeof inferior_registers); | |
194 | ||
c5aa993b JM |
195 | memcpy (®isters[REGISTER_BYTE (FP0_REGNUM)], inferior_fp_registers.f_st, |
196 | sizeof inferior_fp_registers.f_st); | |
c906108c | 197 | memcpy (®isters[REGISTER_BYTE (FPC_REGNUM)], |
c5aa993b JM |
198 | &inferior_fp_registers.f_ctrl, |
199 | sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st); | |
c906108c SS |
200 | } |
201 | ||
202 | /* Store our register values back into the inferior. | |
203 | If REGNO is -1, do this for all registers. | |
204 | Otherwise, REGNO specifies which register (so we can save time). */ | |
205 | ||
206 | void | |
fba45db2 | 207 | store_inferior_registers (int regno) |
c906108c SS |
208 | { |
209 | struct regs inferior_registers; | |
210 | struct fp_state inferior_fp_registers; | |
c906108c SS |
211 | |
212 | memcpy (&inferior_registers, registers, 20 * 4); | |
213 | ||
214 | memcpy (inferior_fp_registers.f_st, | |
c5aa993b JM |
215 | ®isters[REGISTER_BYTE (FP0_REGNUM)], |
216 | sizeof inferior_fp_registers.f_st); | |
c906108c | 217 | memcpy (&inferior_fp_registers.f_ctrl, |
c5aa993b JM |
218 | ®isters[REGISTER_BYTE (FPC_REGNUM)], |
219 | sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st); | |
220 | ||
c906108c SS |
221 | #ifdef PTRACE_FP_BUG |
222 | if (regno == FP_REGNUM || regno == -1) | |
223 | /* Storing the frame pointer requires a gross hack, in which an | |
224 | instruction that moves eax into ebp gets single-stepped. */ | |
225 | { | |
226 | int stack = inferior_registers.r_reg[SP_REGNUM]; | |
227 | int stuff = ptrace (PTRACE_PEEKDATA, inferior_pid, | |
228 | (PTRACE_ARG3_TYPE) stack); | |
229 | int reg = inferior_registers.r_reg[EAX]; | |
230 | inferior_registers.r_reg[EAX] = | |
231 | inferior_registers.r_reg[FP_REGNUM]; | |
c5aa993b JM |
232 | ptrace (PTRACE_SETREGS, inferior_pid, |
233 | (PTRACE_ARG3_TYPE) & inferior_registers); | |
c906108c SS |
234 | ptrace (PTRACE_POKEDATA, inferior_pid, (PTRACE_ARG3_TYPE) stack, |
235 | 0xc589); | |
236 | ptrace (PTRACE_SINGLESTEP, inferior_pid, (PTRACE_ARG3_TYPE) stack, | |
237 | 0); | |
238 | wait (0); | |
239 | ptrace (PTRACE_POKEDATA, inferior_pid, (PTRACE_ARG3_TYPE) stack, | |
240 | stuff); | |
241 | inferior_registers.r_reg[EAX] = reg; | |
242 | } | |
243 | #endif | |
244 | ptrace (PTRACE_SETREGS, inferior_pid, | |
c5aa993b | 245 | (PTRACE_ARG3_TYPE) & inferior_registers); |
c906108c | 246 | ptrace (PTRACE_SETFPREGS, inferior_pid, |
c5aa993b | 247 | (PTRACE_ARG3_TYPE) & inferior_fp_registers); |
c906108c | 248 | } |